An experimental system of two‐dimensional tat bandwidth compression for television signals
Masayuki Tanimoto, Masahiro Kageyama, Masayuki Murakami · Electronics and Communications in Japan (Part I Communications) · 1989
Abstract In the TAT (time‐axis transform) picture bandwidth compression system the pixels are selectively utilized. Because of its high reproducibility of the details of a picture, an application is expected to the bandwidth compression of HDTV (high‐definition TV) and other pictures of high quality. In the one‐dimensional (1–D) TAT system, the pixels are reduced and interpolated along the horizontal direction. This paper reports on the two‐dimensional (2–D) TAT system which reduces and interpolates the pixels not only in the horizontal direction but also in the vertical direction. Using this system, a system for the color TV signal with 7–MHz bandwidth was constructed, which compresses the bandwidth to one‐half in real‐time. Compared with the 1–D system, the number of modes is reduced from 3 to 2, and the size of the block is increased from 8 to 16 pixels. Then the mode information is reduced to approximately one‐third the 1–D system. On the other hand, a faithful picture is obtained with little degradation of resolution both in moving and still pictures. Sometimes a flicker is observed due to the time‐variation of the mode in the reconstructed picture, which can be suppressed by the new mode decision scheme with a hysteresis.